re: Anyone ever drive the Autobahn?

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Yeah it really is. I wonder how much money it takes to keep it up so well. I guess geographically Germany is tiny compared to the US so its a apples and oranges.

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Even though way smaller area wise, the Autobahn is still around 17% of total length of the interstate system. I'd like to know the cost difference as well.

For starters, interstate is usually 8 inches thick while the Autobahn is 30 inches. And to quote from this Brian's Autobahn guide

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Maintenance is superb. Crews inspect every square meter of the system periodically using vehicles with high-tech road scanning equipment. When a fissure or other defect is found, the entire road section is replaced.

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that can't be cheap...